Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bfd2ca3641d6e35…

MALICIOUS

PDF

85.0 KB Created: 2021-09-21 00:36:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 44248964e6efd3539209d73930e540a1 SHA-1: 038a30c42c1fe10ee7a751995c38a7b02321ce60 SHA-256: 4bfd2ca3641d6e3579a4680f032d06bbaa6a1a7072e94dc67e4ffee2cf1c6d0e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links, pointing towards a phishing or malware distribution scheme. While no scripts were directly extracted, the presence of embedded URLs and the nature of the link farm heuristic suggest an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://asoriofrio.org/ckfinder/userfiles/files/damelajogajurudere.pdf In PDF document text
    • http://hasicimosnov.cz/foto/Image/file/dizeliro.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/10988378264.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/rebimidamun.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/12088257328.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/sezarotiso.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/megozuwidusiradurukasoki.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/32642838545.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/161413931bda49---35698829698.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/gerolob.pdfIn PDF document text
    • http://medi-sen.com/files/files/84618756370.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/1049713487.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/34107050877.pdfIn PDF document text
    • http://ktai.lmg.jp/upload/file/kafexalux.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/mikosijo.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/9608774949.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/37709795148.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/zexirimegoregiwutidifepiv.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/kotuliximuraduluv.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/bilimetikitavitupadurixes.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/venebowipobamabuzade.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/metavemosurodozot.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/6674355152.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/lemilabuzobum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=musify+app+for+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CD 17760 bytes
SHA-256: a068daba5183da9f2b440124421856b69db31c55b47ecc3586b6c8499f419244
font_02_sfnt_off00012f0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0D 10424 bytes
SHA-256: cf33443f888b76c96d6ad0ebd6f197c70b83bbe71a499a16b03030fdbeebf046